Do I have to somehow open the input files in the script?

Yes.

open my $input_file, '<', $input_filename or die "Cannot open input fi
+le $input_filename:  $!.\n";
while (my $input_line = <$input_file>) {
    chomp $input_line;
    print "[$input_line]\n";
}
close $input_file;

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In reply to Re^5: reading files to different output files. by marinersk
in thread reading files to different output files. by ic23oluk

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